-LRB- CNN -RRB- -- The mother of a 17-year-old Rochester , New York , high school student who vanished over the weekend on spring break in Myrtle Beach , South Carolina , says she did not give her daughter permission to go on the trip .

Brittanee Marie Drexel 's mom says she thought she was at the beach in New York , not South Carolina .

In an appearance on HLN 's Nancy Grace , Dawn Drexel said her daughter , Brittanee Marie Drexel , has never run away .

Drexel said the high school junior stayed in touch with her by phone , and she last spoke with Brittanee on Saturday afternoon .

`` I asked her what she was doing and she says ` Oh , mom , I 'm at the beach . ' And it was an 80-degree day in Rochester so , of course , I thought maybe she was at the beach in Rochester with one of her girlfriends that she had said she was staying overnight , '' Drexel said . Watch mom describe daughter 's last call ''

Drexel said she asked Brittanee to call her later and the girl agreed . `` I said , ' I love you , Brittanee ' and she says , ' I love you , mom . ' And then we hung up the phone . ''

Brittanee is believed to have last been seen Saturday evening , though an unconfirmed sighting may have placed her at a restaurant on Sunday .

She was staying with friends at the Bar Harbor Hotel on North Ocean Boulevard , according to police reports .

@highlight

Brittanee Drexel disappears on trip to Myrtle Beach , South Carolina

@highlight

Mom says she spoke to daughter but did n't know she was out of state

@highlight

Brittanee is believed to have last been seen Saturday evening